The Evidence - Brotherly Bond, #5

FBI agent Thomas Mason continues the search for his wife's killer, even though his boss at the Bureau has ordered him to leave it alone. Working outside the law, he teams up with his old special forces squad mate, Jude Scott, who now works for a small pharmaceutical manufacturer, makers of the secret wonder drug, Clarity. Users of the miracle pill are being targeted by the same people who killed Agent Mason's wife, and these people don't care how many bodies they leave in their wake.
With attacks coming from all sides, Mason and Scott narrow down the list of suspects and take the fight to them. When they discover a familiar face behind it all, they won't know who they can trust anymore.